First, they attended Christmas eve mass together on Dec. 24, a source tells Us magazine.

“They were serious but seemed like one family unit,” another source describes to Us. “The kids were between them most of the time, but Arnold and Maria definitely seemed civil and would talk once in a while. They hugged the pastor at the end of the service and seemed warm and happy.”

The next day Maria and Arnold celebrated Christmas at their home in Brentwood, Calif., an insider tells People. They also went to the LA Lakers opening game together later in the afternoon.

They “had a really nice time” over the holiday, shares the insider.

Maria and Arnold separated in May, 25 years after they wed, when Maria found out that Arnold had secretly fathered a child with their housekeeper Mildred Baena 13 years before.

Maria is reportedly reconsidering taking Arnold back. According to TMZ, her religion makes it hard for her to get a divorce. And now Arnold is desperately trying to win Maria back by being “extremely sweet” to her and buying her expensive gifts.